This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Dreptersiel. Stone arch of th century valve Sieltor of the lower river Weser where it is liable to the tide For more than century the stones had been hidden in the dike They were discovered with the renovation of the dike in the own upload shot in User Ulamm Dikes in Lower Saxony Weser in Loxstedt Coastal engineering thcentury